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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd9ba56319a6663cc8397f99a5fc6873ef1aac9754404f7bead2041c26f0e1a' 
  AND token = '7qyoqslDvY4nMlDxgGGxmj1cQci8r191pT+OMzQ3rYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}